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Rifles, Reloading, Optics, Equipment
Gunsmithing
How I Barrel A Precision Custom Rifle - Long Rifles, LLC
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<blockquote data-quote="NesikaChad" data-source="post: 395973" data-attributes="member: 7449"><p>Inspection is a process of checking the total indicated runout (TIR) of the chamber and the barrel tennon. I check the chamber in two locations. Up by the shoulder/body junction and back at the web just in front of the breech. I check the tennon at behind the shoulder where there's no threads. (recoil lug sits here)</p><p></p><p>I use a Brown and Sharp "best test" indicator with a .00005" resolution. </p><p></p><p>Lets see how this one came out.</p><p></p><p>Case web area looks to be .00005" TIR. (I can live with that)</p><p></p><p><img src="http://i165.photobucket.com/albums/u64/nesikachad/barrel%20work/DSC_0066-1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Close up view:</p><p></p><p><img src="http://i165.photobucket.com/albums/u64/nesikachad/barrel%20work/DSC_0068-1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Now onto the body/shoulder junction:</p><p></p><p>Zeroing the indicator since it moved due to the taper in the case:</p><p></p><p><img src="http://i165.photobucket.com/albums/u64/nesikachad/barrel%20work/DSC_0071-2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i165.photobucket.com/albums/u64/nesikachad/barrel%20work/DSC_0072-1.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Here's our number, .00015". Most chambers are considered "good" if TIR is held to within .001". In this case its about 6 1/2 times inside of that dimension.</p><p></p><p>Now the tennon. .00015" again is the number.</p><p></p><p><img src="http://i165.photobucket.com/albums/u64/nesikachad/barrel%20work/DSC_0074.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>With everything checked and completed now its onto flipping her around and getting the crown tuned up.</p></blockquote><p></p>
[QUOTE="NesikaChad, post: 395973, member: 7449"] Inspection is a process of checking the total indicated runout (TIR) of the chamber and the barrel tennon. I check the chamber in two locations. Up by the shoulder/body junction and back at the web just in front of the breech. I check the tennon at behind the shoulder where there's no threads. (recoil lug sits here) I use a Brown and Sharp "best test" indicator with a .00005" resolution. Lets see how this one came out. Case web area looks to be .00005" TIR. (I can live with that) [IMG]http://i165.photobucket.com/albums/u64/nesikachad/barrel%20work/DSC_0066-1.jpg[/IMG] Close up view: [IMG]http://i165.photobucket.com/albums/u64/nesikachad/barrel%20work/DSC_0068-1.jpg[/IMG] Now onto the body/shoulder junction: Zeroing the indicator since it moved due to the taper in the case: [IMG]http://i165.photobucket.com/albums/u64/nesikachad/barrel%20work/DSC_0071-2.jpg[/IMG] [IMG]http://i165.photobucket.com/albums/u64/nesikachad/barrel%20work/DSC_0072-1.jpg[/IMG] Here's our number, .00015". Most chambers are considered "good" if TIR is held to within .001". In this case its about 6 1/2 times inside of that dimension. Now the tennon. .00015" again is the number. [IMG]http://i165.photobucket.com/albums/u64/nesikachad/barrel%20work/DSC_0074.jpg[/IMG] With everything checked and completed now its onto flipping her around and getting the crown tuned up. [/QUOTE]
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How I Barrel A Precision Custom Rifle - Long Rifles, LLC
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